| /* |
| * Copyright © 2000 SuSE, Inc. |
| * Copyright © 2007 Red Hat, Inc. |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that |
| * copyright notice and this permission notice appear in supporting |
| * documentation, and that the name of SuSE not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. SuSE makes no representations about the |
| * suitability of this software for any purpose. It is provided "as is" |
| * without express or implied warranty. |
| * |
| * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE |
| * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "pixman-private.h" |
| |
| typedef enum |
| { |
| ARM_V7 = (1 << 0), |
| ARM_V6 = (1 << 1), |
| ARM_VFP = (1 << 2), |
| ARM_NEON = (1 << 3), |
| ARM_IWMMXT = (1 << 4) |
| } arm_cpu_features_t; |
| |
| #if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT) |
| |
| #if defined(_MSC_VER) |
| |
| /* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */ |
| #include <windows.h> |
| |
| extern int pixman_msvc_try_arm_neon_op (); |
| extern int pixman_msvc_try_arm_simd_op (); |
| |
| static arm_cpu_features_t |
| detect_cpu_features (void) |
| { |
| arm_cpu_features_t features = 0; |
| |
| __try |
| { |
| pixman_msvc_try_arm_simd_op (); |
| features |= ARM_V6; |
| } |
| __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) |
| { |
| } |
| |
| __try |
| { |
| pixman_msvc_try_arm_neon_op (); |
| features |= ARM_NEON; |
| } |
| __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) |
| { |
| } |
| |
| return features; |
| } |
| |
| #elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */ |
| |
| #include "TargetConditionals.h" |
| |
| static arm_cpu_features_t |
| detect_cpu_features (void) |
| { |
| arm_cpu_features_t features = 0; |
| |
| features |= ARM_V6; |
| |
| /* Detection of ARM NEON on iOS is fairly simple because iOS binaries |
| * contain separate executable images for each processor architecture. |
| * So all we have to do is detect the armv7 architecture build. The |
| * operating system automatically runs the armv7 binary for armv7 devices |
| * and the armv6 binary for armv6 devices. |
| */ |
| #if defined(__ARM_NEON__) |
| features |= ARM_NEON; |
| #endif |
| |
| return features; |
| } |
| |
| #elif defined(__ANDROID__) || defined(ANDROID) /* Android */ |
| |
| #include <cpu-features.h> |
| |
| static arm_cpu_features_t |
| detect_cpu_features (void) |
| { |
| arm_cpu_features_t features = 0; |
| AndroidCpuFamily cpu_family; |
| uint64_t cpu_features; |
| |
| cpu_family = android_getCpuFamily(); |
| cpu_features = android_getCpuFeatures(); |
| |
| if (cpu_family == ANDROID_CPU_FAMILY_ARM) |
| { |
| if (cpu_features & ANDROID_CPU_ARM_FEATURE_ARMv7) |
| features |= ARM_V7; |
| |
| if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFPv3) |
| features |= ARM_VFP; |
| |
| if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) |
| features |= ARM_NEON; |
| } |
| |
| return features; |
| } |
| |
| #elif defined (__linux__) /* linux ELF */ |
| |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/mman.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <elf.h> |
| |
| static arm_cpu_features_t |
| detect_cpu_features (void) |
| { |
| arm_cpu_features_t features = 0; |
| Elf32_auxv_t aux; |
| int fd; |
| |
| fd = open ("/proc/self/auxv", O_RDONLY); |
| if (fd >= 0) |
| { |
| while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) |
| { |
| if (aux.a_type == AT_HWCAP) |
| { |
| uint32_t hwcap = aux.a_un.a_val; |
| |
| /* hardcode these values to avoid depending on specific |
| * versions of the hwcap header, e.g. HWCAP_NEON |
| */ |
| if ((hwcap & 64) != 0) |
| features |= ARM_VFP; |
| if ((hwcap & 512) != 0) |
| features |= ARM_IWMMXT; |
| /* this flag is only present on kernel 2.6.29 */ |
| if ((hwcap & 4096) != 0) |
| features |= ARM_NEON; |
| } |
| else if (aux.a_type == AT_PLATFORM) |
| { |
| const char *plat = (const char*) aux.a_un.a_val; |
| |
| if (strncmp (plat, "v7l", 3) == 0) |
| features |= (ARM_V7 | ARM_V6); |
| else if (strncmp (plat, "v6l", 3) == 0) |
| features |= ARM_V6; |
| } |
| } |
| close (fd); |
| } |
| |
| return features; |
| } |
| |
| #else /* Unknown */ |
| |
| static arm_cpu_features_t |
| detect_cpu_features (void) |
| { |
| return 0; |
| } |
| |
| #endif /* Linux elf */ |
| |
| static pixman_bool_t |
| have_feature (arm_cpu_features_t feature) |
| { |
| static pixman_bool_t initialized; |
| static arm_cpu_features_t features; |
| |
| if (!initialized) |
| { |
| features = detect_cpu_features(); |
| initialized = TRUE; |
| } |
| |
| return (features & feature) == feature; |
| } |
| |
| #endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */ |
| |
| pixman_implementation_t * |
| _pixman_arm_get_implementations (pixman_implementation_t *imp) |
| { |
| #ifdef USE_ARM_SIMD |
| if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6)) |
| imp = _pixman_implementation_create_arm_simd (imp); |
| #endif |
| |
| #ifdef USE_ARM_IWMMXT |
| if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT)) |
| imp = _pixman_implementation_create_mmx (imp); |
| #endif |
| |
| #ifdef USE_ARM_NEON |
| if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON)) |
| imp = _pixman_implementation_create_arm_neon (imp); |
| #endif |
| |
| return imp; |
| } |